bugfix: 'join' works on str, not String

1 files changed, 1 insertions, 1 deletions

diff --git a/interpreter.py b/interpreter.py
index 299dde8..a5fab45 100644
--- a/interpreter.py
+++ b/interpreter.py
@@ -716,7 +716,7 @@ def interpretJoin(symbol, args, env):
     target = evaluate(args[1], env)
     if not isinstance(target, String):
         raise InterpretPanic(symbol, "expects a :string as its second argument", target)
-    return String(target.value.join(lst.args))
+    return String(target.value.join([a.value for a in lst.args]))
 
 GLOBALS.register("join", Builtin(interpretJoin, 2))